25 MAN-GD-2300-002
Calibration Procedure
Use this procedure to calibrate each hopper on the drill separately.
1. Determine the Desired Seed Rate in lbs./acre.
2. Raise the drill so that drive wheel will rotate and prepare a means to catch the seed Sample. (a plastic tarp
works well for this.)
3. Calculate your drill’s Actual Seeding Rate using the following formula:
Seeding Rate (lbs./acre) = 5609 x S
N x W
Where:
S = Sample weight in ounces.
N = Number of turns of drive wheel.
W = Width of swath you are catching in inches
3 openers on 6-2/3” spacing = 20”
10 openers on 7-1/2” spacing = 75”
Example: You catch 6 oz. of soybeans from 3 openers on 7-1/2” spacing after turning the drive wheel
30 revolutions. What rate in lbs./acre is his drill currently seeding?
Seeding Rate (lbs./acre) = ___5609 x 6 oz. = 49.86 or about 50 lbs./acre
30 turns x 22.5"
Note: The larger the sample size, the more accurate the calibration will be. Catch seed from as many
openers as possible and turn the drive-wheel until you have enough seed to accurately weigh.
4. Compare the Actual Seeding Rate to the Desired Seeding Rate and adjust the Meter Lever and/or the
sprocket setting to increase or decrease the seeding rate.
5. Repeat this procedure until the Actual Seeding Rate is equal to the desired Seeding Rate.
Caution
Caution: Seed Charts are provided for starting point
only. Always calibrate the drill to your specific seed to
ensure proper rates.
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